The last galactic alignment was 1998.
There's no hard and fast definition of galactic alignment because it's pseudoscience and its proponents don't agree (they never do with this sort of thing) on what it actually is. There are 4 versions:
1) The crossing of the galactic equator by the solstice. This happened in 1998 (it happens twice every 26,000 years) and since it consisited of an imaginary line crossing an imaginary plane - nothing happened (rather like an imaginary line extending from the hour hand of your clock pointing at the Statue of Liberty).
2) The apparent lining up of the Sun with the plane of the Milky Way near the area of the Dark Rift. This happens every year.
3) The apparent lining up of the Sun exactly over the centre of the Milky Way galaxy, where a black hole resides. This never happens and even if it did, it would have no effect whatsoever.
4) The passing of the solar system through the central plane of the galaxy. This last happened 3 million years ago and won't happen again for another 30 million years.
All this is explained in more detail if you click on the menu to the left of the page.
The only one of these alignments involving precession is 1). Precession is not a one-off event. It's been going on for billions of years and will continue for billions more.
